Test refactoring

compiler/testData/diagnostics/tests/smartCasts/kt3899.kt

@@ -0,0 +1,13 @@
+data class StringPair(val first: String, val second: String)
+
+fun String.to(second: String) = StringPair(this, second)
+
+fun hashMapOf(<!UNUSED_PARAMETER!>pair<!>: StringPair): MutableMap<String, String> {
+<!NO_RETURN_IN_FUNCTION_WITH_BLOCK_BODY!>}<!>
+
+fun F() : MutableMap<String, String> {
+    val value: String? = "xyz"
+    if (value == null) throw Error()
+    // Smart cast should be here
+    return hashMapOf("sss" to <!DEBUG_INFO_SMARTCAST!>value<!>)  
+}